, u(t) U0, u(t) - , .
u(t) > , (. 19.19). u(t) < E', (. 19.20). E < u(t) < E', (. 19.21). , . , , (t) = f[ux(t)]. .
. (. 19.22, , ) (. 19.23, , ) . . 19.22 . , u(t) ≈ , R R.
U > 0, , R << R, . , .
, . , R , :
(19.13)
R >> R, . R ( 2-2') , , . ( ) . 19.22, , .
, , .
. 19.23, , . u(t) , R << R0, R0 , . . 19.23, :
(19.14)
R/R0 << 1 , u = E.
, Ro6p >> R0. , .
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, . 19.23, , , 0 ( ), . R0 .
, ,
R/R0, Rop/R. R > R R >> R , R << R0. , .
. 19.23, : -n-- ( ) .
. . 19.24, , . 19.24, . : , ux(t) u , 2 ( U2) 1 (u1), , R2/R1. u(t) > u2 + u1, 2 ul u2.